Plio-Pleistocene planktonic foraminifera biostratigraphy and biochronology

上更新世浮游有孔虫生物地层学和生物年代学

基本信息

批准号：
2059416
负责人：
金额：
--
依托单位：
University College London
依托单位国家：
英国
项目类别：
Studentship
财政年份：
2018
资助国家：
英国
起止时间：
2018 至无数据
项目状态：
已结题

来源：
https://gtr.ukri.org/projects?ref=studentship-2059416
关键词：
Plio Pleistocene planktonic foraminifera biostratigraphy

项目摘要

Planktonic foraminifera have one of the most complete fossil records, and thanks to their overwhelming abundance in the oceans, they provide great means for dating and correlation of marine sediments. Effective use of planktonic foraminifera requires a good knowledge of species biostratigraphic ranges with reliable age calibrations for their evolution and extinction. The current biochronology combines data from a small number of localities and in many cases relies on age-calibrations from a single site. Studies from multiple sites and various regions are required to test reliability of these calibrations and to replace them with new regional ages if necessary. The deep-sea drill cores recovered during recent International Ocean Discovery Program (IODP) expeditions to the Indo-Pacific (Exp. 363) and South Atlantic (Exp. 390/393), contain abundant and well-preserved assemblages of planktonic foraminifera. Reliable magneto-stratigraphic age control throughout Plio-Pleistocene sedimentary sequences, provides great opportunity to re-address and re-calibrate many of the bioevents. Our initial study of the sampled material led to description of a new species of fossil planktonic foraminifera and allowed the identification of a number of bioevents with timing contrasting from published ages. Results of ongoing research will provide new high-resolution data, improving global biostratigraphy and biochronology of Plio-Pleistocene planktonic foraminifera.

浮游有孔虫拥有最完整的化石记录之一，并且由于它们在海洋中数量巨大，为海洋沉积物的年代测定和关联提供了很好的手段。浮游有孔虫的有效利用需要充分了解物种的生物地层范围，并对其进化和灭绝进行可靠的年龄校准。当前的生物年代学结合了来自少数地点的数据，并且在许多情况下依赖于单个地点的年龄校准。需要来自多个地点和不同地区的研究来测试这些校准的可靠性，并在必要时用新的地区年龄替换它们。最近国际海洋发现计划 (IODP) 对印度太平洋 (Exp. 363) 和南大西洋 (Exp. 390/393) 的考察中回收的深海钻芯含有丰富且保存完好的浮游有孔虫组合。整个上皮奥-更新世沉积序列的可靠磁地层年龄控制，为重新解决和重新校准许多生物事件提供了绝佳的机会。我们对采样材料的初步研究导致了对浮游有孔虫化石新物种的描述，并鉴定了许多生物事件，其时间与已发表的年龄不同。正在进行的研究结果将提供新的高分辨率数据，改善上里欧-更新世浮游有孔虫的全球生物地层学和生物年代学。